Fix broken system tests due to missing parameter in robot load callback assert

[rtuck99]

Fixes broken a system test in test_load_centre_collect_full_plan due to a change in the robot load callback implementation in

• Add code for robot load #1078

Link to dodal PR (if required): #N/A
(remember to update pyproject.toml with the dodal commit tag if you need it for tests to pass!)

Instructions to reviewer on how to test:

1. Do thing x
2. Confirm thing y happens

Checks for reviewer

• Would the PR title make sense to a user on a set of release notes

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (f66b267) to head (75cf8db).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1142   +/-   ##
=======================================
  Coverage   88.92%   88.92%           
=======================================
  Files         118      118           
  Lines        7416     7416           
=======================================
  Hits         6595     6595           
  Misses        821      821           

Components	Coverage Δ
i24 SSX	75.58% <ø> (ø)
hyperion	96.80% <ø> (ø)
other	97.98% <ø> (ø)

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[DominicOram]

Great, thanks!